Pneumatic pump



H. S. ROGERS NEUMATIC PUMP Filed Feb. 11 1920 A LF M B5 flag (@QQ W Patented Nov. 6, 1923.

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nouns 5. ROGERS, or mtwanxnn, wrsconsimnssronon 'ro MILWAUKEE, WISCONSIN. v

JOHN B.- BALL,

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A pplicationflled February n, 1920, aerial seesaw.

To azzwhmami 00mm.- Be it known that I, HoMnR S. Rooms, a

citizen of the United States residing at Milwaukee in the county of Milwaukee and State of Wisconsin, have invented certain new; and useful Im rovements in Pneumatic Pumps, of WhlCh the followi is a specification, reference being had to t e accompanying drawing, forming a part there- This invention relates to pneumatic pumps and the object of the invention is to improve the construction and operation of pneumatic pumps in the manner to'be hereinafter described and claimal.

Referring to the drawin which accomanies this specification an forms a part ereof, which drawing illustrates an embodiment of this invention, the figure is a vertical section of a pneumatic pump.

Referring to the drawing, the reference numeral 1 designates a pump chamber,2 a water inlet port, 3 a water outlet port, 4 a compressed air inlet port, and 5 an air outlet or exhaust port. A pipe 6, connected with any suitable source of supply of compressed air, communicates with the compressed air inlet port 4 and the flow of air into the pump chamber is controlled by a com pressed air valve 7. The air outlet or exhaust port 5 is controlled by an air exhaust valve 8. The water inlet port 2 is controlled by the water inlet valve 9 and a water outlet, or check, valve 10 prevents Water from returning from the water discharge pipe 11 into the pump chamber.

The com ressed air valve 7 and the air 20, this construction being a lost-motion con-- struction so that the movements of the float- 20 will not move the lever 14 until the bail 19 contacts either with the top or the bottom of the slot 18. A vent 21, of small size as compared with the water outlet port 3, is controlled by a valve 22 and the valve 22 is closed by the float .20, as the float rises,

and is opened by'the float, as the float drops.

The float 20 may be connected with the valve 22 by any suitable motion transmitt ng mechanism as, forexample, a lever 23 fulcrumed on a pin 24. j

The air outlet or exhaust port 5 is made large enough so that the air exhaust valve 8 will be held seated or closed by .the diflerence between the pressure in the pump chamber and outside thereof and hold the levers 12 and 14 up in the positions illustrated by the drawing and the float20is made sufiiciently heavy so that it will pull the air exhaust valve 8 ofl from its seat when the water level has fallen sufiiciently low in the pump chamber. The effective weight of the float 20 will, of course, be dimimshed in proportion to its submergence in the water and will be increased as the submergence is decreased.

The operation of the pump is as follows. The drawing shows the parts in the positions which they occupy when water has filled the pump chamber to the point where the air exhaust valve 8 has been closed and the compressed air valve 7 has been opened. Compressedair is entering the pump chamber and driving the water out through the water discharge pipe 11. The check valve 10 is open and the water inlet valve 9 and thevalve 22 are closed. The bail 19 is at the upper end of the elongated slot 18. As the water level in the pump chamber is lowcred, the float 20 will fall until the bail 19 engages with the lower end of the slot 18, meanwhile lifting the valve 22 and opening the vent 21. The water will continue to be driven out of the pump chamber leaving more and more of the float 20 unsubmerged until the weight of the float has increased sufficiently to pull the air exhaust valve 8 oil from its seat and close the compressed air valve 7. The check valve 10 will now close and the Water inlet valve 9 will open and water will flow into the pump chamber and elevate the float 20 until the bail 19 engages the upper end of the slot 18 and moves the lever 14 high enough to close the air exhaust valve 8 and open the compressed air valve 7 meanwhile closing the valve 22. The water inlet valve 9 will now close and the water will be forced from the pump chamber as hereinbefore described.

The closing of the valve 22 does not prevent the closing of the air exhaust valve 8 because, when the air exhaust valve 8 is nearly closed the compressed air valve 7 will be nearly wide open and the rush of compressed air through the outlet or air exhaust port will seat the air exhaust valve 8, the upper end of the slot 18 in the lever 14 being free to move up away from the bail 19, as will be readily understood.

The vent 21- and the valve 22 are provided so that the float 20, if it begins to descend, must continue to descend to open the air exhaust valve 8 and close the compressed air valve 7 without regard to the escape of water from the water discharge pipe 11.

What is claimed is:

1. In a pneumatic pump, the combination with a pump chamber provided with a water inlet port, a vent, a compressed air inlet port, an air exhaust port and a Water outlet port, of a water inlet valve, a water vent valve, a compressed air valve and an air exhaust valve, the air exhaust port being of sufficient size so that the air exhaust valve will be retained closed by the difierence between the pressure in the pump Lavaaae chamber and outside thereof, the water vent valve being connected with a float to be opened as the float descends and the float being connected with the air exhaust valve and being sufiiciently heavy to force the air exhaust valve from its seat as the float descends.

2. In a pneumatic pump, the combination with a pump chamber provided with a water inlet port, a water vent, a compressed air inlet port, an air exhaust port and a water outlet port, of a water inlet valve, a Water vent valve, a compressed air valve and an air exhaust valve, the air exhaust port being of suflicient size so that the air exhaust valve will be retained closed by the difference between the pressure in the pump chamber and outside thereof, the water vent valve being connected with a float and the air exhaust valve being connected with the float by a lost-motion construction.

In witness whereof I hereto aflix my signature.

HOMER S. ROGERS. 

